CN104533679A - Fuel injection control valve and high-pressure common rail fuel injection system comprising same - Google Patents

Fuel injection control valve and high-pressure common rail fuel injection system comprising same Download PDF

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Publication number
CN104533679A
CN104533679A CN201410840430.4A CN201410840430A CN104533679A CN 104533679 A CN104533679 A CN 104533679A CN 201410840430 A CN201410840430 A CN 201410840430A CN 104533679 A CN104533679 A CN 104533679A
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China
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valve
oil
decompression valves
pocket
solenoid valve
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CN201410840430.4A
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CN104533679B (en
Inventor
龙美彪
欧阳玲湘
黄民备
刘成
谭四喜
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NANYUE ELECTRONIC CONTROL (HENGYANG) INDUSTRY TECHNOLOGY Co Ltd
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NANYUE ELECTRONIC CONTROL (HENGYANG) INDUSTRY TECHNOLOGY Co Ltd
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Abstract

The invention discloses a fuel injection control valve and a high-pressure common rail fuel injection system comprising the fuel injection control valve. The fuel injection control valve is composed of a valve body, a solenoid electric valve component and a decompression valve component. The fuel injection beginning point is changed by adjusting the power-on beginning point of an excitation coil, and the fuel injection quantity is changed by adjusting the power-on time of the excitation coil. The flow area of the solenoid electric valve component is larger than the flow area of the decompression valve component, and the opening pressure of the decompression valve component is slightly higher than the opening pressure of a fuel injector so as to obtain the fuel injection characteristics of slow first and urgent second and increase the fuel injection response speed. The decompression valve component enables the fuel injector to be in a fuel drainage state at the final stage of fuel injection, so the fuel injector can cut off fuel more rapidly. A control valve element of the decompression valve component is of a fuel pressure self-balancing form structure, so the driving current of the excitation coil can be reduced, and the service life of a solenoid valve can be prolonged. According to the high-pressure common rail fuel injection system, since the fuel injection control valve and the mechanical fuel injector are combined, flexible control over the fuel injection beginning point and the fuel injection quantity can be achieved.

Description

A kind of injector control valve and use the high pressure common rail fuel injection system of this injector control valve
Technical field
The present invention relates to a kind of injector control valve that can control beginning of injection and fuel injection quantity, and use the high pressure common rail fuel injection system of this injector control valve.
Background technique
Supply in system at the fuel oil of diesel engine, traditional mechanical type fuel injection system, because control freedom degree is little, control accuracy is low, is difficult to ensure that each fuel injection parameters carries out optimal control according to corresponding engine operating condition.And common rail system changes the composition structure of traditional mechanical type Injection Pump system, the generation of its injection pressure is totally independent of rotating speed and the course of injection of motor, the real independence achieving injection pressure, beginning of injection, fuel injection quantity and multi-injection and Flexible Control, improve the combination property of the power character of diesel engine, Economy, discharge and noise aspect greatly.Common rail system, meets the optimal selection of state three, state four or more maximum discharge standard, extensively in each engine art, should comprise road vehicle, generator set, boats and ships, engineering machinery etc. as diesel engine.
Common rail system is primarily of high-pressure fuel-feed pump, common rail chamber and high-pressure oil pipe, oil sprayer, controller, various kinds of sensors and wire harness composition.Oil transfer pump from fuel tank by fuel delivery to the oil input channel of high-pressure fuel-feed pump, high-pressure fuel-feed pump driven by the engine will be sent into after fuel pressurization in common rail chamber, then by each cylinder injector of electromagnetic valve in corresponding moment oil spout.
Electric-controlled fuel injector is most critical and the most complicated parts in joint-track type oil-fired system.Its effect is: the control signal sent according to engine controller, and open and close by controlling electric-controlled fuel injector, high pressure fuel sprays into burning chamber of diesel engine with the injection timing of the best, fuel injection quantity and injection rate.In order to realize this series of complex process, design, the links such as processing and use of oil sprayer are all very important: in order to realize predetermined fuel injection characteristic, need carry out rational optimal design to oil sprayer.The size of the volume in control room determines sensitivity when needle-valve opens and closes.The face area of the Flow characteristics of oil return metering-orifice and oil-feed metering-orifice and conformity and control piston determines injector valve and opens stability, the shortest injection process and stablize minimum fuel injection quantity; The realization of these functions all needs the part of very high manufacturing accuracy.Because the difficulty of processing of electric-controlled fuel injector key components and parts is large, conforming product rate is low; Oil product, product turbidity test and Environmental Conditions are required very strict, and maintenance cost is high.These high requests constrain the promotion and application of common rail system to a certain extent.
Summary of the invention
One of technical problem to be solved by this invention is intended to the solenoid electric valve in electric-controlled fuel injector to be separated with oil nozzle, designs a kind of injector control valve.
One of technical problem to be solved by this invention is integrated in common rail system by described injector control valve, forms a kind of novel Electrocontrolled high-pressure common rail fuel injection system.
Technical problem to be solved by this invention can be achieved through the following technical solutions:
Injector control valve, comprising:
Valve body, is provided with Electromagnetic Control valve member installation cavity on the top of described valve body, both sides, middle part are respectively arranged with common rail chamber interface and oil sprayer interface, and bottom is configured with Decompression valves parts installation cavity and return tube interface; Decompression valves oil input channel, oil drain valve back oil road, oil back chamber, total back oil road, solenoid valve oil input channel, solenoid valve oil road is configured with in described valve body; One end of described solenoid valve oil input channel and described common rail chamber orifice, the other end of solenoid valve oil input channel is communicated with described Electromagnetic Control valve member installation cavity; One end of described total back oil road and described return tube orifice, the other end of total back oil road is communicated with described oil back chamber; One end of described Decompression valves oil road is communicated with described oil back chamber, and the other end of Decompression valves oil road is communicated with described Decompression valves parts installation cavity; One end of described Decompression valves oil input channel is communicated with described Decompression valves parts installation cavity, the other end of Decompression valves oil input channel is communicated with described solenoid valve oil road, one end of described solenoid valve oil road and described oil sprayer orifice, the other end is communicated with described Electromagnetic Control valve member installation cavity;
One is arranged on the oil drain valve parts in described Decompression valves parts installation cavity, during described oil drain valve component working, will close with open-minded between described Decompression valves oil input channel and described Decompression valves oil road;
One is arranged on the Electromagnetic Control valve member in described Electromagnetic Control valve member installation cavity, during described solenoid electric valve component working, will close with open-minded between described solenoid valve oil input channel and solenoid valve oil road;
The circulation area of described Decompression valves parts is less than the circulation area of electromagnetic valve components.
In a preferred embodiment of the invention, described Electromagnetic Control valve member comprises electromagnet, field coil, armature, locking swivel nut, controls spool, valve pocket and valve seat; Described locking swivel nut is threaded with the female thread portion in described Electromagnetic Control valve member installation cavity and is arranged in described Electromagnetic Control valve member installation cavity by described valve pocket and valve seat, the bottom surface of described valve seat contacts with sealing at the bottom of the chamber of described Electromagnetic Control valve member installation cavity, described valve pocket is between the bottom surface and the end face of described valve seat of described locking screw seat, and the bottom surface of valve pocket seals with the end face of described valve seat and contacts;
Solenoid valve oil inlet hole, solenoid valve oil outlet and valve base center hole is configured with in described valve seat, the apical margin of described valve base center hole is provided with inferior pyramidal sealing ring surface, the lower end of described solenoid valve oil inlet hole is communicated with the other end of the solenoid valve oil input channel in described valve body, and the upper end of solenoid valve oil inlet hole is communicated with described valve base center hole; The lower end of described solenoid valve oil outlet is communicated with the described solenoid valve oil road in described valve body; The bottom of described valve base center hole is communicated with the oil back chamber in described valve body;
From top to bottom be configured with coaxial solenoid valve cushion block installation cavity, valve pocket center hole and center gap bridge oil pocket successively at the center of described valve pocket, described center gap bridge oil pocket is communicated with the upper end of described solenoid valve oil outlet;
From top to bottom configure coaxial have necking down hole and solenoid valve spring at the center of described locking swivel nut successively and take up hole;
The periphery of described control spool is from top to bottom disposed with spring load section, valve pocket seal section, axial position restriction section and valve base sealing section, be provided with the annular groove that an external diameter is less than the described axial position restriction external diameter of section and the external diameter of described valve base sealing section on described valve base sealing section top, the transition position limiting section at described annular groove and described axial position is configured with a upper conical sealing ring surface, after the spring load section cover solenoid spring and solenoid valve cushion block of described control spool, the necking down hole and the solenoid valve spring that whole control spool are inserted into described locking swivel nut take up hole, the valve pocket center hole of described valve pocket, in the valve base center hole of described valve seat, the solenoid valve spring that wherein said solenoid valve spring is positioned at described locking swivel nut takes up hole, the end face that upper end and the described solenoid valve spring of described solenoid valve spring take up hole contacts, the lower end of solenoid valve spring contacts with described solenoid valve cushion block end face, the bottom surface of described solenoid valve cushion block contacts with the end face of described valve pocket seal section, described solenoid valve cushion block is limited in the solenoid valve cushion block installation cavity of described valve pocket, when upper conical sealing ring surface on described control spool and the inferior pyramidal sealing ring surface in described valve seat seal and contact, annular groove on described control spool is positioned at described valve base center hole and is communicated with the solenoid valve oil inlet hole of described valve seat, when upper conical sealing ring surface on described control spool separates with the inferior pyramidal sealing ring surface in described valve seat, solenoid valve oil inlet hole in described valve seat is communicated with center gap bridge oil pocket by the annular groove on described control spool, and and then be communicated with described solenoid valve oil outlet by pass a bridge oil pocket, avris gap bridge oil pocket of center,
Described armature is arranged on the upper end of described control spool by fastening piece and is positioned at the top of described locking swivel nut;
Described electromagnet is arranged on the top of described valve body by the very tight cap of electromagnetism, and described field coil is configured in described electromagnet; Being configured with adjustment pad between described electromagnet and described valve body, between the bottom surface of described electromagnet and described armature end face, leaving solenoid valve air gap, by regulating the thickness of adjustment pad, getting final product the size of electromagnetic valve for adjusting air gap.
In a preferred embodiment of the invention, be configured with avris gap bridge oil pocket in the bottom surface of described valve pocket, described avris gap bridge oil pocket is communicated with the upper end of described solenoid valve oil outlet with described center gap bridge oil pocket respectively.
In a preferred embodiment of the invention, the internal diameter of described valve pocket center hole is less than the internal diameter of described solenoid valve cushion block installation cavity and the internal diameter of center gap bridge oil pocket but equals the internal diameter of described valve base center hole; The internal diameter of described center gap bridge oil pocket is greater than the internal diameter of described valve base center hole simultaneously.
In a preferred embodiment of the invention, the valve base center hole that takes up in the solenoid valve cushion block installation cavity of hole and described valve pocket, valve pocket center hole, center gap bridge oil pocket and described valve seat of the necking down hole of described locking swivel nut and solenoid valve spring is coaxial;
In a preferred embodiment of the invention, described control spool is tubular structure.
In a preferred embodiment of the invention, the external diameter of described spring load section is less than the external diameter of described valve base sealing section, and the external diameter of described axial position restriction section is greater than the external diameter of described valve pocket seal section and the external diameter of described valve base sealing section.
In a preferred embodiment of the invention, closely spaced first couple is formed secondary between described valve pocket seal section and described valve pocket center hole, form closely spaced second couple between described valve base sealing section and described valve base center hole secondary, the first couple length sum that is secondary and the second couple pair is the seal length of high pressure fuel.
In a preferred embodiment of the invention, the very tight cap of described electromagnetism adopts engagement thread to be connected with described valve body, is configured with seal ring between the very tight cap of described electromagnetism and described valve body.
In a preferred embodiment of the invention, described Decompression valves parts comprise pressure releasing valve core, pressure release valve seat, Decompression valves cushion block, Decompression valves spring, adjustment pad, pressure relief valve body, have a Decompression valves spring mounting hole in described pressure relief valve body, this pressure relief valve body is arranged in described Decompression valves parts installation cavity and is also also pressed on by described pressure release valve seat in described Decompression valves parts installation cavity, have sealing bulge loop in the top side configuration of described pressure release valve seat, described sealing bulge loop seals with the chamber end face of described Decompression valves parts installation cavity and contacts, center in described pressure release valve seat by lower and under be disposed with coaxial pressure release oil pocket and pressure releasing valve core positioning hole, in described pressure release valve seat, be also provided with a radial oil leak hole and from top to bottom configure by draining section and positioning section on the outer circumferential face of this pressure release valve seat, the outer circumferential face of described positioning section coordinates with the inner peripheral surface of described Decompression valves parts installation cavity locates, the outer circumferential face of described draining section and the inner peripheral surface of described Decompression valves parts installation cavity form certain gap and form an annular drain pan, the outer end of described radial oil leak hole is communicated with described annular drain pan, the inner of radial oil leak hole is communicated with described pressure release oil pocket, inferior pyramidal sealing ring surface is configured with at the apical margin of described pressure release oil pocket,
Described pressure releasing valve core is from top to bottom made up of seal section, necking segment, pressure release valve seat seal section and Decompression valves cushion block linkage section successively; The upper conical sealing ring surface be sealed and matched with the inferior pyramidal sealing ring surface of described pressure release oil pocket apical margin is provided with at described seal section and necking segment transition joint; After the pressure release oil pocket that described pressure releasing valve core is arranged on described pressure release valve seat and pressure releasing valve core positioning hole, described seal section in described pressure releasing valve core is positioned at the top of described pressure release oil pocket, described necking segment is positioned at described pressure release oil pocket, it is secondary that described pressure release valve seat seal section and described pressure releasing valve core positioning hole complement each other to form closely spaced couple, and described Decompression valves cushion block linkage section extends the bottom surface of described pressure release valve seat and continues to extend in Decompression valves spring mounting hole; When the upper conical sealing ring surface on described pressure releasing valve core and the inferior pyramidal sealing ring surface of described pressure release oil pocket apical margin seal contact time, be disconnected between oil drain valve oil input channel in described draining chamber and described valve body, and then close between described Decompression valves oil input channel and described Decompression valves oil road; When the upper conical sealing ring surface on described pressure releasing valve core does not contact with the inferior pyramidal sealing ring surface of described pressure release oil pocket apical margin, be communicated with between described draining chamber and the oil drain valve oil input channel in described valve body, and then be communicated with between described Decompression valves oil input channel with described Decompression valves oil input channel;
Described Decompression valves cushion block is arranged on described Decompression valves cushion block linkage section by fastening piece, and the end face of described Decompression valves cushion block contacts with the bottom surface of pressure release valve seat seal section; Described Decompression valves spring and adjustment pad are configured in described Decompression valves spring mounting hole, the bottom surface of wherein said adjustment pad contacts with at the bottom of the hole of described Decompression valves spring mounting hole, the upper end of described Decompression valves spring contacts with the bottom surface of described Decompression valves cushion block, and the lower end of Decompression valves spring contacts with the end face of described adjustment pad.
In a preferred embodiment of the invention, the internal diameter of described pressure release oil pocket is greater than the internal diameter of described pressure releasing valve core positioning hole.
In a preferred embodiment of the invention, the external diameter of described positioning section is greater than the external diameter of described draining section.
In a preferred embodiment of the invention, the external diameter of described seal section is greater than the external diameter of the external diameter of described necking segment, the external diameter of described pressure release valve seat seal section and described Decompression valves cushion block linkage section, and the external diameter of described pressure release valve seat seal section is greater than the external diameter of described necking segment and the external diameter of described Decompression valves cushion block linkage section.
A kind of high pressure common rail fuel injection system, comprise fuel tank, oil transfer pump, high-pressure fuel-feed pump, common rail chamber, oil sprayer and controller, it is characterized in that, also comprise aforesaid injector control valve, described controller connects the sensor in described common rail chamber and the solenoid valve in high-pressure fuel-feed pump, Electromagnetic Control valve member in injector control valve by wire harness, filler opening in described high-pressure fuel-feed pump connects described fuel tank by transport pipe, described oil transfer pump is serially connected on described transport pipe, in described high-pressure fuel-feed pump, oil outlet connects the high pressure filler opening in described common rail chamber by high-pressure oil pipe, the high-pressure oil outlet in described common rail chamber is connected to the common rail chamber interface in described injector control valve by high-pressure oil pipe, return tube interface in described injector control valve is connected to the second return tube by the first return tube, one end of second return tube is connected to the return opening of described high-pressure fuel-feed pump, the other end of the second return tube is connected to the 3rd return tube, one end of 3rd return tube is connected to the return opening of described oil sprayer, the other end of the 3rd return tube connects described fuel tank.
Owing to have employed technological scheme as above, common rail system of the present invention adopts injector control valve and traditional positive injector to combine the function carrying out alternative electric-controlled fuel injector.Therefore to realize the function of common rail system of the present invention, the restriction of the shortcomings such as electric-controlled fuel injector technology difficulty is large, cost is high, maintenance difficult can not be subject to.
The mode adopting injector control valve and positive injector to combine in the present invention can realize beginning of injection, fuel injection quantity Flexible Control.Use common rail system of the present invention, desirable motor injection timing can being obtained by regulating the energising initial point of field coil in injector control valve, per engine cycle fuel injection quantity can be changed by regulating length current"on"time of field coil.
Injector control valve of the present invention adopts Electromagnetic Control valve member and Decompression valves component combined structure, the circulation area of design Electromagnetic Control valve member is greater than the circulation area of Decompression valves, and design Decompression valves parts cracking pressure slightly larger than injection pressure of injector, therefore can obtain first slow rear anxious fuel injection characteristic, significantly can improve the combustion characteristic of motor.And improve oil spout speed of response by the ratio of Reasonable adjustment solenoid electric valve circulation area and Decompression valves circulation area.
Control spool in injector control valve of the present invention adopts fuel pressure self balancing form structure, therefore only need less electromagnetic force that solenoid electric valve can be made to open, oil spout speed of response can be significantly improved, but also the driving current of field coil can be reduced, the working life of solenoid valve can be improved.
The Decompression valves component function designed in injector control valve of the present invention can make oil sprayer also be in draining state latter stage in oil spout simultaneously, and therefore this common rail system is rapider than conventional machinery formula oil sprayer oil-break at the oil-break in oil spout latter stage.So apply common rail system of the present invention, the fuel injection characteristic of engine combustion more can be conducive to.
Accompanying drawing explanation
Fig. 1 is injector control valve structural representation of the present invention.
Fig. 2 is the A enlarged diagram of Fig. 1.
Fig. 3 is the A enlarged diagram of Fig. 2.
Fig. 4 is the B enlarged diagram of Fig. 1.
Fig. 5 is the B enlarged diagram of Fig. 4.
Fig. 6 is high pressure common rail fuel injection system of the present invention composition schematic diagram.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
See Fig. 1 to Fig. 5, the injector control valve provided in figure comprises valve body 21, Electromagnetic Control valve member and Decompression valves parts.
Be provided with Electromagnetic Control valve member installation cavity 21b on the top of valve body 21, both sides, middle part are respectively arranged with common rail chamber interface Y and oil sprayer interface M, and bottom is configured with Decompression valves parts installation cavity 21c and return tube interface N; Decompression valves oil input channel 21d, oil drain valve back oil road 21a, oil back chamber 21e, total back oil road 21f, solenoid valve oil input channel 21g, solenoid valve oil road 21h is configured with in valve body 21.
Common rail chamber interface Y is designed to inner bolt hole shape, is connected, is connected by high-pressure oil pipe 6 with common rail chamber 5 to facilitate with high-pressure oil pipe 6 (see Fig. 6).
Oil sprayer interface M is inner bolt hole shape, is connected, is connected by high-pressure oil pipe 7 with oil sprayer 9 to facilitate with high-pressure oil pipe 7 (see Fig. 4).
Return tube interface N is inner bolt hole shape, is connected with oil pipe 10 (see Fig. 4) to facilitate, by being connected of oil pipe 10 and return tube 4.
One end of solenoid valve oil input channel 21g is communicated with common rail chamber interface Y, and the other end is communicated with Electromagnetic Control valve member installation cavity 21b.
One end of total back oil road 21f is communicated with return tube interface N, and the other end is communicated with oil back chamber 21e.
One end of Decompression valves oil road 21d is communicated with oil back chamber 21e, and the other end is communicated with Decompression valves parts installation cavity 21c.
One end of Decompression valves oil input channel 21a is communicated with Decompression valves parts installation cavity 21c, and the other end is communicated with solenoid valve oil road 21h.
Solenoid valve oil road 21h one end is communicated with Electromagnetic Control valve member installation cavity 21b, and the other end is communicated with oil sprayer interface M.
Electromagnetic Control valve member is arranged in Electromagnetic Control valve member installation cavity 21b, during this solenoid electric valve component working, will close between solenoid valve oil input channel 21g and solenoid valve oil road 21h with open-minded.
This Electromagnetic Control valve member specifically comprises electromagnet 14, field coil 15, armature 34, locking swivel nut 36, controls spool 32, valve pocket 20 and valve seat 31; Locking swivel nut 36 is threaded with the female thread portion in Electromagnetic Control valve member installation cavity 21b and is arranged in Electromagnetic Control valve member installation cavity 21b by valve pocket 20 and valve seat 31, the bottom surface of valve seat 31 contacts with sealing at the bottom of the chamber of Electromagnetic Control valve member installation cavity 21b, valve pocket 20 is between the bottom surface of locking screw seat 33 and the end face of valve seat 31, and the bottom surface of valve pocket 20 seals with the end face of valve seat 31 and contacts.
Solenoid valve oil inlet hole 31a, solenoid valve oil outlet 31b and valve base center hole 31c is configured with in valve seat 31, the apical margin of valve base center hole 31c is provided with inferior pyramidal sealing ring surface 31d, the lower end of solenoid valve oil inlet hole 31a is communicated with the other end of the solenoid valve oil input channel 21g in valve body 21, and the upper end of solenoid valve oil inlet hole 31a is communicated with valve base center hole 31c; The lower end of solenoid valve oil outlet 31b is communicated with the one end of the solenoid valve oil road 21h in valve body 21; The bottom of valve base center hole 31c is communicated with the oil back chamber 21e in valve body 21.
Coaxial solenoid valve cushion block installation cavity 20a, valve pocket center hole 20b and center gap bridge oil pocket 20c is from top to bottom configured with successively at the center of valve pocket 20, be configured with avris gap bridge oil pocket 20d in the bottom surface of valve pocket 20, avris gap bridge oil pocket 20d is communicated with the upper end of solenoid valve oil outlet 31b with center gap bridge oil pocket 20c respectively; The internal diameter of valve pocket center hole 20b is less than the internal diameter of solenoid valve cushion block installation cavity 20a and the internal diameter of center gap bridge oil pocket 20c but equals the internal diameter of valve base center hole 31c; The internal diameter of center gap bridge oil pocket 20c is greater than the internal diameter of valve base center hole 31c simultaneously.
From top to bottom necking down hole 33a is configured with successively and solenoid valve spring takes up hole 33b at the center of locking swivel nut 33; The valve base center hole 31c that the locking necking down hole 33a of swivel nut 33 and solenoid valve spring take up in solenoid valve cushion block installation cavity 20a, the valve pocket center hole 20b of hole 33b and valve pocket 20, center gap bridge oil pocket 20c and valve seat 31 is coaxial.
Controlling spool 32 is tubular structure, the periphery controlling spool 32 is from top to bottom disposed with spring load section 32a, valve pocket seal section 32b, axial position restriction section 32c and valve base sealing section 32d, the external diameter of spring load section 32a is less than the external diameter of valve base sealing section 32b, and the external diameter of axial position restriction section 32c is greater than the external diameter of valve pocket seal section 32b and the external diameter of valve base sealing section 32d.
Be provided with the annular groove 32e that an external diameter is less than the axial position restriction external diameter of section 32c and the external diameter of valve base sealing section 32d on valve base sealing section 32d top, the transition position limiting section 32c at annular groove 32e and axial position is configured with a upper conical sealing ring surface 32f.
After the spring load section cover 32a solenoid spring 18 controlling spool 32 and solenoid valve cushion block 19, the necking down hole 33a and the solenoid valve spring that whole control spool 32 are inserted into locking swivel nut 33 take up hole 33b, the valve pocket center hole 20b of valve pocket 20, in the valve base center hole 31c of valve seat 31, wherein solenoid valve spring 18 be positioned at locking swivel nut 33 solenoid valve spring take up hole 33b, the end face that upper end and the solenoid valve spring of solenoid valve spring 18 take up hole 33b contacts, lower end contacts with solenoid valve cushion block 19 end face, armature 34 so just can be made to keep leaving the trend of electromagnet 14 and make the upper conical sealing ring surface 32e on control the spool 32 and inferior pyramidal sealing ring surface 31d in valve seat 31 keep sealing contact condition.
The bottom surface of solenoid valve cushion block 19 contacts with the end face of valve pocket seal section 32b, and solenoid valve cushion block 19 is limited in the solenoid valve cushion block installation cavity 20a of valve pocket 20.
Closely spaced first couple is formed secondary between valve pocket seal section 32b and valve pocket center hole 20b, form closely spaced second couple between valve base sealing section 32d and valve base center hole 31c secondary, the first couple length sum that is secondary and the second couple pair is the seal length of high pressure fuel.
When upper conical sealing ring surface 32e on control spool 32 and the inferior pyramidal sealing ring surface 31d in valve seat 31 seal and contact, the annular groove 32e controlled on spool 32 is positioned at valve base center hole 32d and is communicated with the solenoid valve oil inlet hole 31a of valve seat 32, when controlling the upper conical sealing ring surface 32e on spool 32 and separating with the inferior pyramidal sealing ring surface 31d in valve seat, solenoid valve oil inlet hole 31a in valve seat 31 is communicated with center gap bridge oil pocket 20c by the annular groove 32e controlled on spool 32, and and then by center gap bridge oil pocket 20c, avris gap bridge oil pocket 20d is communicated with solenoid valve oil outlet 31b.
Armature 34 is arranged on the upper end of control spool 32 by screw 16 and is positioned at the top of locking swivel nut 33.
Electromagnet 14 is arranged on the top of valve body 21 by the very tight cap 36 of electromagnetism, and the very tight cap 36 of electromagnetism is threaded with valve body 21.Field coil 15 is configured in electromagnet 14, and it is drawn by the pairs of posts 37 be arranged on electromagnet 14, and a pairs of posts 37 is connected with the drive circuit in controller 12 by wire harness 13a.O RunddichtringO 17 is configured with between the very tight cap 36 of electromagnetism and valve body 21, be configured with between electromagnet 14 and valve body 21 and adjust pad 35, leaving solenoid valve air gap L1 between the bottom surface of electromagnet 14 and armature 34 end face, adjusting the size of solenoid valve air gap L1 by changing adjustment pad 35 thickness size.
Control spool 32 and adopt fuel pressure self balancing form structure, therefore the pretightening force only needing less electromagnetic force to overcome solenoid valve spring 18 just can make control spool 32 move solenoid electric valve is opened, oil spout speed of response can be significantly improved, but also the size of driving current can be reduced, the working life of Electromagnetic Control valve member can be improved.The upper conical sealing ring surface 32e controlled on spool 32 keeps the effect sealing the sealing surface E that contact condition is formed to be block solenoid valve oil input channel 31a to be connected with solenoid valve oil road 31b with the inferior pyramidal sealing ring surface 31d in valve seat 31.When controlling spool 32 and moving to dotted line position, fuel flow communication area K1 reaches maximum.K1 is calculated as follows:
K1=π×(R1+R2)×S1×sln(θ1)
In formula:
K1: solenoid electric valve circulation area;
R1: the least radius of solenoid electric valve circulation area;
R2: the maximum radius of solenoid electric valve circulation area;
S1: the stroke controlling spool 32; Thickness size H1 by adjustment solenoid valve cushion block 19 changes the size of S1;
θ 1: the cone angle of sealing surface E.
Decompression valves parts are made up of pressure releasing valve core 22, pressure release valve seat 23, Decompression valves cushion block 24, Decompression valves spring 27, adjustment pad 29, pressure relief valve body 30.
Have a Decompression valves spring mounting hole 30a in pressure relief valve body 30, this pressure relief valve body 30 adopts engagement thread to be arranged in Decompression valves parts installation cavity 21c and is also also pressed on by pressure release valve seat 23 in Decompression valves parts installation cavity 21c.O-ring seals 28 is adopted to seal between pressure relief valve body 30 and valve body 21.
Have sealing bulge loop 23b in the top side configuration of pressure release valve seat 23, sealing bulge loop 23b seals with the chamber end face of Decompression valves parts installation cavity 21c and contacts; Center in pressure release valve seat 23 by lower and under be disposed with coaxial pressure release oil pocket 23c and pressure releasing valve core positioning hole 23d, the internal diameter of pressure release oil pocket 23c is greater than the internal diameter of pressure releasing valve core positioning hole 23d.In pressure release valve seat 23, be also provided with a radial oil leak hole 23a and from top to bottom configure on the outer circumferential face of this pressure release valve seat 23 by draining section 23e and positioning section 23f, the external diameter of positioning section 23f is greater than the external diameter of draining section 23e and the outer circumferential face of this positioning section 23f coordinates with the inner peripheral surface of Decompression valves parts installation cavity 21c and locates, and the outer circumferential face of draining section 23e and the inner peripheral surface of Decompression valves parts installation cavity 21c form certain gap and form an annular drain pan 23h.The outer end of radial oil leak hole 23a is communicated with annular drain pan 23h, and the inner is communicated with pressure release oil pocket 23c, and annular drain pan 23h is communicated with Decompression valves oil input channel 21d; Inferior pyramidal sealing ring surface 23g is configured with at the apical margin of pressure release oil pocket pressure release oil pocket 23c.
Pressure releasing valve core 22 is from top to bottom made up of seal section 22a, necking segment 22b, pressure release valve seat seal section 22c and Decompression valves cushion block linkage section 22d successively, the external diameter of seal section 22a is greater than the external diameter of the external diameter of necking segment 22b, the external diameter of pressure release valve seat seal section 22c and Decompression valves cushion block linkage section 22d, and the external diameter of pressure release valve seat seal section 22c is greater than the external diameter of necking segment 22b and the external diameter of Decompression valves cushion block linkage section 22d.
The upper conical sealing ring surface 22e be sealed and matched with the inferior pyramidal sealing ring surface 23g of pressure release oil pocket 23c apical margin is provided with at seal section 22a and necking segment 22b transition joint.
After the pressure release oil pocket 23c that pressure releasing valve core 22 is arranged on pressure release valve seat 23 and pressure releasing valve core positioning hole 23d, seal section 22a in pressure releasing valve core 22 is positioned at the top of pressure release oil pocket 23c, necking segment 22b is positioned at pressure release oil pocket 23c, it is secondary that pressure release valve seat seal section 22c and pressure releasing valve core positioning hole 23d complements each other to form closely spaced couple, and the length of thread engagement of this couple pair is the seal section length of fuel oil.
Decompression valves cushion block linkage section 22d extends the bottom surface of pressure release valve seat 22 and continues to extend in Decompression valves spring mounting hole 30a; When the upper conical sealing ring surface 22e on pressure releasing valve core 22 and the inferior pyramidal sealing ring surface 23g of pressure release oil pocket 23c apical margin seal contact time, be disconnected between oil drain valve oil input channel 21a in draining chamber 23c and valve body 21, and then close between Decompression valves oil road 21d and Decompression valves oil input channel 21a; When the upper conical sealing ring surface 22e on pressure releasing valve core 22 does not contact with the inferior pyramidal sealing ring surface 23g of pressure release oil pocket 23c apical margin, be communicated with between draining chamber 23c and the oil drain valve oil input channel 21a in valve body 21, and then be communicated with between Decompression valves oil road 21d with Decompression valves oil input channel 21a;
Decompression valves cushion block 24 is arranged on Decompression valves cushion block linkage section 22d by locking nut 26, compression spring 25, the end face of Decompression valves cushion block 24 contacts with the bottom surface of pressure relief valve body seal section 22d, carries out axially locating together with locking nut 26, compression spring 25 to Decompression valves cushion block 24.
Decompression valves spring 27 and adjustment pad 29 are configured in Decompression valves spring mounting hole 23a, and the bottom surface wherein adjusting pad 29 contacts with at the bottom of the hole of Decompression valves spring mounting hole 30a.The upper end of Decompression valves spring 27 contacts with the bottom surface of Decompression valves cushion block 24, and lower end contacts with the end face of adjustment pad 29.The effect of Decompression valves spring 27 makes Decompression valves cushion block 24 and pressure releasing valve core 22 keep principle to adjust the mobile trend of pad 29.
Upper conical sealing ring surface 22e on pressure releasing valve core 22 seals to contact with the inferior pyramidal sealing ring surface 23g of pressure release oil pocket 23c apical margin and forms sealing surface F, and the effect of sealing surface F blocks Decompression valves oil input channel 21a to be connected with Decompression valves oil road 21d.External force suffered by pressure releasing valve core 22 is mainly from the fuel pressure of Decompression valves oil input channel 21a and the initial tension of spring of Decompression valves spring 27; When the fuel pressure acting on pressure releasing valve core 22 upper-end surface is greater than the initial tension of spring of pressure release spring 27, pressure releasing valve core 22 moves down, and Decompression valves oil input channel 21a does not communicate with Decompression valves oil road 21a; When the fuel pressure acting on pressure releasing valve core 22 upper-end surface is less than the initial tension of spring of pressure release spring 27, pressure releasing valve core 22 moves, Decompression valves oil input channel 21a is connected with Decompression valves oil road 21d, is now the cracking pressure P2 of Decompression valves.Thickness size T2 by changing adjustment pad 29 adjusts the cracking pressure P2 of Decompression valves.When pressure releasing valve core 22 moves to dotted line position, fuel flow communication area K2 reaches maximum.K2 is calculated as follows:
K2-π×(R3+R4)×S2×θin(θ2)
In formula:
K2: Decompression valves circulation area;
R3: the least radius of Decompression valves circulation area;
R4: the maximum radius of Decompression valves circulation area;
S2: the stroke of pressure releasing valve core 22; Thickness size H2 by adjustment Decompression valves cushion block 24 changes the size of S2;
θ 2: the cone angle of pressure releasing valve core 22 sealing surface F;
For realizing the function of injector control valve, the thickness size T2 that need arrange adjustment pad 29 makes Decompression valves cracking pressure P2 slightly larger than the cracking pressure P1 of oil sprayer 9, and makes K1 be greater than K2 by the value of adjustment S1, S2, R1, R2, R3, R4, θ 1, θ 2.
See Fig. 6, a kind of high pressure common rail fuel injection system, comprise fuel tank 1, oil transfer pump 2, high-pressure fuel-feed pump 3, common rail chamber 5, oil sprayer 9 and controller 12, it also comprises aforesaid injector control valve 8, and controller connects the pairs of posts 37 (see Fig. 1) in sensor in common rail chamber 5 and the solenoid valve in high-pressure fuel-feed pump 3, the Electromagnetic Control valve member in injector control valve 8 by wire harness 13b, 13c, 13a; Filler opening 3a in high-pressure fuel-feed pump 3 connects fuel tank 1 by transport pipe 2a, oil transfer pump 2 is serially connected on transport pipe 2a, in high-pressure fuel-feed pump 3, oil outlet 3b connects the high pressure filler opening 5a in common rail chamber 5 by high-pressure oil pipe 3c, the high-pressure oil outlet 5b in common rail chamber 5 is connected to common rail chamber interface Y (see Fig. 1) in injector control valve 8 by high-pressure oil pipe 6, return tube interface N in injector control valve 8 is connected to return tube 4 by return tube 10, one end of return tube 4 is connected to the return opening 3d of high-pressure fuel-feed pump 3, and the other end of return tube 4 is connected to return tube 11.One end of return tube 11 is connected to the return opening of oil sprayer 9, and the other end connects fuel tank 1.
Fuel from fuel tank 1 enters common rail chamber 5 through oil transfer pump 2, high-pressure fuel-feed pump 3, sprayed by oil sprayer 9 through injector control valve 8 by common rail chamber 5 again, the unnecessary fuel oil of high-pressure fuel-feed pump 3, injector control valve 8, oil sprayer 9 is back in fuel tank 1 respectively by return tube 4,10,11, and in figure, in each pipeline, the direction of arrow is the flow direction of fuel oil.
Composition graphs 1 to Fig. 4, when common rail system of the present invention (see Fig. 6) works, is full of the high pressure fuel equal with common rail chamber 5 pressure in the solenoid valve oil input channel 21g in the valve body 21 of injector control valve 8, the solenoid valve oil inlet hole 31a in valve seat 31.When controller 12 sends oil spout instruction, after field coil 15 energising of injector control valve 8, electromagnet 14 produces the initial tension of spring that electromagnetic force overcomes solenoid valve spring 18, armature 34 is together moved with control spool 32, the sealing surface E controlled between spool 32 and valve seat 31 opens, solenoid electric valve oil input channel 21g is connected with solenoid valve oil road 21h, and fuel oil enters oil sprayer interface M and Decompression valves oil input channel 21a by solenoid valve oil road 21g.When fuel pressure is less than the cracking pressure P1 of oil sprayer 9, fuel oil from solenoid valve oil road 21g only can flow to Decompression valves oil input channel 21a, because the Decompression valves parts cracking pressure P2 of injector control valve 8 is slightly larger than the cracking pressure P1 of oil sprayer 9, sealing surface F in the Decompression valves parts of now injector control valve 8 opens, fuel oil enters Decompression valves oil road 21d through the sealing surface F that Decompression valves parts are opened, and then enters return tube 10,4 and is back to fuel tank 1.Circulation area K2 due to Decompression valves parts is less than the circulation area K1 of Electromagnetic Control valve member, therefore the fuel oil entering the volume space (hereinafter referred to as adapter cavity) that Decompression valves oil input channel 21a, solenoid valve oil road 21h and oil sprayer interface M are formed is many, fuel-displaced few; So the fuel pressure in adapter cavity can continue to raise.When fuel pressure is increased to oil sprayer 9 cracking pressure P1, fuel injection beginning.Because the oil spout Initial Injection Rate of oil sprayer 9 is low, so fuel pressure still can rise fast; Simultaneously because of the cracking pressure P1 of Decompression valves cracking pressure P2 slightly larger than oil sprayer 9, so fuel pressure can rise to the cracking pressure P2 being greater than Decompression valves parts very soon, now pressure releasing valve core 22 moves down, Decompression valves parts are closed, the closed Decompression valves oil input channel 21a that blocks of sealing surface F is connected with Decompression valves oil road 21d, and adapter cavity pressure rises rapidly, and therefore oil sprayer 9 injection rate increases rapidly, so first slow rear anxious fuel injection characteristic can be obtained, the combustion characteristic of motor significantly can be improved.
When controller 12 sends oil-break instruction, after field coil 15 power-off, electromagnetic force disappears, and armature 34 moves down under the spring-force driven dual of solenoid valve spring 18 with control spool 32, and sealing surface E closes, and blocks high pressure fuel and enters adapter cavity from solenoid valve oil input channel 21g.Supplement owing to there is no the lasting of fuel oil, along with the oil spout of oil sprayer 9 is carried out, fuel pressure in adapter cavity can reduce gradually, when fuel oil is reduced to Decompression valves cracking pressure P2, pressure releasing valve core 22 moves, adapter cavity is connected with Decompression valves oil road 21d, draining starts, adapter cavity pressure declines rapidly, and when transition cavity pressure drops to the cracking pressure P1 of oil sprayer 9, oil sprayer 9 stops oil spout.Because the cracking pressure P2 of Decompression valves parts is slightly larger than the cracking pressure P1 of oil sprayer 9, so when the pressure of adapter cavity is in P2 to P1 scope, while oil sprayer 9 oil spout, Decompression valves parts are also in draining state, and therefore oil sprayer 9 can be rapider than the oil sprayer oil-break of common tradition mechanical governor pressure oil pumping system at the oil-break in oil spout latter stage.So use common rail system of the present invention, the injection characteristics of engine combustion more can be conducive to.
The diesel engine applying common rail system of the present invention can obtain desirable beginning of injection by regulating the energising initial point of field coil 15, can change per engine cycle fuel injection quantity by regulating length current"on"time of field coil 15.
By adjusting the ratio W of electromagnetic valve components circulation area K1 and Decompression valves parts circulation area K2, the oil spout response time of common rail system of the present invention can be adjusted.Analyze theoretically, ratio W is larger, and oil spout response is faster.But the circulation area K2 due to Decompression valves parts is subject to the restriction of manufacturing capacity, can not design very little, the restriction that electromagnetic valve components stroke S1 is subject to electromagnet 14 performance also can not design too large, and therefore ratio W can not design too large.So the ratio of appropriate design solenoid electric valve circulation area K1 and Decompression valves circulation area K2, oil spout speed of response can be improved.
Under normal operation, the fuel pressure stablized under the closed loop control of controller 12 in common rail chamber 5 is certain value.According to the demand of engine operating condition, controller 12 sends oil spout instruction, and injector control valve 8 is energized, fuel oil enters oil sprayer 9 through injector control valve 8, when fuel pressure is higher than oil sprayer 9 cracking pressure, fuel injection beginning, the size of fuel injection quantity is determined by length current"on"time of injector control valve 8.
More than show and describe basic principle of the present invention, major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain has appending claims and equivalent thereof to define.

Claims (14)

1. injector control valve, is characterized in that, comprising:
Valve body, is provided with Electromagnetic Control valve member installation cavity on the top of described valve body, both sides, middle part are respectively arranged with common rail chamber interface and oil sprayer interface, and bottom is configured with Decompression valves parts installation cavity and return tube interface; Decompression valves oil input channel, oil drain valve back oil road, oil back chamber, total back oil road, solenoid valve oil input channel, solenoid valve oil road is configured with in described valve body; One end of described solenoid valve oil input channel and described common rail chamber orifice, the other end of solenoid valve oil input channel is communicated with described Electromagnetic Control valve member installation cavity; One end of described total back oil road and described return tube orifice, the other end of total back oil road is communicated with described oil back chamber; One end of described Decompression valves oil road is communicated with described oil back chamber, and the other end of Decompression valves oil road is communicated with described Decompression valves parts installation cavity; One end of described Decompression valves oil input channel is communicated with described Decompression valves parts installation cavity, the other end of Decompression valves oil input channel is communicated with described solenoid valve oil road, one end of described solenoid valve oil road and described oil sprayer orifice, the other end is communicated with described Electromagnetic Control valve member installation cavity;
One is arranged on the oil drain valve parts in described Decompression valves parts installation cavity, during described oil drain valve component working, will close with open-minded between described Decompression valves oil input channel and described Decompression valves oil road;
One is arranged on the Electromagnetic Control valve member in described Electromagnetic Control valve member installation cavity, during described solenoid electric valve component working, will close with open-minded between described solenoid valve oil input channel and solenoid valve oil road;
The circulation area of described Decompression valves parts is less than the circulation area of electromagnetic valve components.
2. injector control valve as claimed in claim 1, is characterized in that, described Electromagnetic Control valve member comprises electromagnet, field coil, armature, locking swivel nut, controls spool, valve pocket and valve seat; Described locking swivel nut is threaded with the female thread portion in described Electromagnetic Control valve member installation cavity and is arranged in described Electromagnetic Control valve member installation cavity by described valve pocket and valve seat, the bottom surface of described valve seat contacts with sealing at the bottom of the chamber of described Electromagnetic Control valve member installation cavity, described valve pocket is between the bottom surface and the end face of described valve seat of described locking screw seat, and the bottom surface of valve pocket seals with the end face of described valve seat and contacts;
Solenoid valve oil inlet hole, solenoid valve oil outlet and valve base center hole is configured with in described valve seat, the apical margin of described valve base center hole is provided with inferior pyramidal sealing ring surface, the lower end of described solenoid valve oil inlet hole is communicated with the other end of the solenoid valve oil input channel in described valve body, and the upper end of solenoid valve oil inlet hole is communicated with described valve base center hole; The lower end of described solenoid valve oil outlet is communicated with the described solenoid valve oil road in described valve body; The bottom of described valve base center hole is communicated with the oil back chamber in described valve body;
From top to bottom be configured with coaxial solenoid valve cushion block installation cavity, valve pocket center hole and center gap bridge oil pocket successively at the center of described valve pocket, described center gap bridge oil pocket is communicated with the upper end of described solenoid valve oil outlet;
From top to bottom configure coaxial have necking down hole and solenoid valve spring at the center of described locking swivel nut successively and take up hole;
The periphery of described control spool is from top to bottom disposed with spring load section, valve pocket seal section, axial position restriction section and valve base sealing section, be provided with the annular groove that an external diameter is less than the described axial position restriction external diameter of section and the external diameter of described valve base sealing section on described valve base sealing section top, the transition position limiting section at described annular groove and described axial position is configured with a upper conical sealing ring surface, after the spring load section cover solenoid spring and solenoid valve cushion block of described control spool, the necking down hole and the solenoid valve spring that whole control spool are inserted into described locking swivel nut take up hole, the valve pocket center hole of described valve pocket, in the valve base center hole of described valve seat, the solenoid valve spring that wherein said solenoid valve spring is positioned at described locking swivel nut takes up hole, the end face that upper end and the described solenoid valve spring of described solenoid valve spring take up hole contacts, the lower end of solenoid valve spring contacts with described solenoid valve cushion block end face, the bottom surface of described solenoid valve cushion block contacts with the end face of described valve pocket seal section, described solenoid valve cushion block is limited in the solenoid valve cushion block installation cavity of described valve pocket, when upper conical sealing ring surface on described control spool and the inferior pyramidal sealing ring surface in described valve seat seal and contact, annular groove on described control spool is positioned at described valve base center hole and is communicated with the solenoid valve oil inlet hole of described valve seat, when upper conical sealing ring surface on described control spool separates with the inferior pyramidal sealing ring surface in described valve seat, solenoid valve oil inlet hole in described valve seat is communicated with center gap bridge oil pocket by the annular groove on described control spool, and and then be communicated with described solenoid valve oil outlet by pass a bridge oil pocket, avris gap bridge oil pocket of center,
Described armature is arranged on the upper end of described control spool by fastening piece and is positioned at the top of described locking swivel nut;
Described electromagnet is arranged on the top of described valve body by the very tight cap of electromagnetism, and described field coil is configured in described electromagnet; Being configured with adjustment pad between described electromagnet and described valve body, between the bottom surface of described electromagnet and described armature end face, leaving solenoid valve air gap, by regulating the thickness of adjustment pad, getting final product the size of electromagnetic valve for adjusting air gap.
3. injector control valve as claimed in claim 2, it is characterized in that, be configured with avris gap bridge oil pocket in the bottom surface of described valve pocket, described avris gap bridge oil pocket is communicated with the upper end of described solenoid valve oil outlet with described center gap bridge oil pocket respectively.
4. injector control valve as claimed in claim 2, it is characterized in that, in a preferred embodiment of the invention, the internal diameter of described valve pocket center hole is less than the internal diameter of described solenoid valve cushion block installation cavity and the internal diameter of center gap bridge oil pocket but equals the internal diameter of described valve base center hole; The internal diameter of described center gap bridge oil pocket is greater than the internal diameter of described valve base center hole simultaneously.
5. injector control valve as claimed in claim 2, it is characterized in that, in a preferred embodiment of the invention, the valve base center hole that takes up in the solenoid valve cushion block installation cavity of hole and described valve pocket, valve pocket center hole, center gap bridge oil pocket and described valve seat of the necking down hole of described locking swivel nut and solenoid valve spring is coaxial.
6. injector control valve as claimed in claim 2, it is characterized in that, described control spool is tubular structure.
7. injector control valve as claimed in claim 2, it is characterized in that, the external diameter of described spring load section is less than the external diameter of described valve base sealing section, and the external diameter of described axial position restriction section is greater than the external diameter of described valve pocket seal section and the external diameter of described valve base sealing section.
8. injector control valve as claimed in claim 2, it is characterized in that, in a preferred embodiment of the invention, closely spaced first couple is formed secondary between described valve pocket seal section and described valve pocket center hole, form closely spaced second couple between described valve base sealing section and described valve base center hole secondary, the first couple length sum that is secondary and the second couple pair is the seal length of high pressure fuel.
9. injector control valve as claimed in claim 2, is characterized in that, the very tight cap of described electromagnetism adopts engagement thread to be connected with described valve body, is configured with seal ring between the very tight cap of described electromagnetism and described valve body.
10. injector control valve as claimed in claim 2, it is characterized in that, described Decompression valves parts comprise pressure releasing valve core, pressure release valve seat, Decompression valves cushion block, Decompression valves spring, adjustment pad, pressure relief valve body, have a Decompression valves spring mounting hole in described pressure relief valve body, this pressure relief valve body is arranged in described Decompression valves parts installation cavity and is also also pressed on by described pressure release valve seat in described Decompression valves parts installation cavity, have sealing bulge loop in the top side configuration of described pressure release valve seat, described sealing bulge loop seals with the chamber end face of described Decompression valves parts installation cavity and contacts, center in described pressure release valve seat by lower and under be disposed with coaxial pressure release oil pocket and pressure releasing valve core positioning hole, in described pressure release valve seat, be also provided with a radial oil leak hole and from top to bottom configure by draining section and positioning section on the outer circumferential face of this pressure release valve seat, the outer circumferential face of described positioning section coordinates with the inner peripheral surface of described Decompression valves parts installation cavity locates, the outer circumferential face of described draining section and the inner peripheral surface of described Decompression valves parts installation cavity form certain gap and form an annular drain pan, the outer end of described radial oil leak hole is communicated with described annular drain pan, the inner of radial oil leak hole is communicated with described pressure release oil pocket, inferior pyramidal sealing ring surface is configured with at the apical margin of described pressure release oil pocket,
Described pressure releasing valve core is from top to bottom made up of seal section, necking segment, pressure release valve seat seal section and Decompression valves cushion block linkage section successively; The upper conical sealing ring surface be sealed and matched with the inferior pyramidal sealing ring surface of described pressure release oil pocket apical margin is provided with at described seal section and necking segment transition joint; After the pressure release oil pocket that described pressure releasing valve core is arranged on described pressure release valve seat and pressure releasing valve core positioning hole, described seal section in described pressure releasing valve core is positioned at the top of described pressure release oil pocket, described necking segment is positioned at described pressure release oil pocket, it is secondary that described pressure release valve seat seal section and described pressure releasing valve core positioning hole complement each other to form closely spaced couple, and described Decompression valves cushion block linkage section extends the bottom surface of described pressure release valve seat and continues to extend in Decompression valves spring mounting hole; When the upper conical sealing ring surface on described pressure releasing valve core and the inferior pyramidal sealing ring surface of described pressure release oil pocket apical margin seal contact time, be disconnected between oil drain valve oil input channel in described draining chamber and described valve body, and then close between described Decompression valves oil input channel and described Decompression valves oil road; When the upper conical sealing ring surface on described pressure releasing valve core does not contact with the inferior pyramidal sealing ring surface of described pressure release oil pocket apical margin, be communicated with between described draining chamber and the oil drain valve oil input channel in described valve body, and then be communicated with between described Decompression valves oil input channel with described Decompression valves oil input channel;
Described Decompression valves cushion block is arranged on described Decompression valves cushion block linkage section by fastening piece, and the end face of described Decompression valves cushion block contacts with the bottom surface of pressure release valve seat seal section; Described Decompression valves spring and adjustment pad are configured in described Decompression valves spring mounting hole, the bottom surface of wherein said adjustment pad contacts with at the bottom of the hole of described Decompression valves spring mounting hole, the upper end of described Decompression valves spring contacts with the bottom surface of described Decompression valves cushion block, and the lower end of Decompression valves spring contacts with the end face of described adjustment pad.
11. injector control valves as claimed in claim 10, is characterized in that, the internal diameter of described pressure release oil pocket is greater than the internal diameter of described pressure releasing valve core positioning hole.
12. injector control valves as claimed in claim 10, is characterized in that, the external diameter of described positioning section is greater than the external diameter of described draining section.
13. injector control valves as claimed in claim 10, it is characterized in that, the external diameter of described seal section is greater than the external diameter of the external diameter of described necking segment, the external diameter of described pressure release valve seat seal section and described Decompression valves cushion block linkage section, and the external diameter of described pressure release valve seat seal section is greater than the external diameter of described necking segment and the external diameter of described Decompression valves cushion block linkage section.
14. 1 kinds of high pressure common rail fuel injection systems, comprise fuel tank, oil transfer pump, high-pressure fuel-feed pump, common rail chamber, oil sprayer and controller, it is characterized in that, also comprise the injector control valve described in any one of claim 1 to 13 claim, described controller connects the sensor in described common rail chamber and the solenoid valve in high-pressure fuel-feed pump, Electromagnetic Control valve member in injector control valve by wire harness, filler opening in described high-pressure fuel-feed pump connects described fuel tank by transport pipe, described oil transfer pump is serially connected on described transport pipe, in described high-pressure fuel-feed pump, oil outlet connects the high pressure filler opening in described common rail chamber by high-pressure oil pipe, the high-pressure oil outlet in described common rail chamber is connected to the common rail chamber interface in described injector control valve by high-pressure oil pipe, return tube interface in described injector control valve is connected to the second return tube by the first return tube, one end of second return tube is connected to the return opening of described high-pressure fuel-feed pump, the other end of the second return tube is connected to the 3rd return tube, one end of 3rd return tube is connected to the return opening of described oil sprayer, the other end of the 3rd return tube connects described fuel tank.
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CN114439662A (en) * 2022-02-22 2022-05-06 一汽解放汽车有限公司 Switching valve and common rail system

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CN106050500A (en) * 2016-05-31 2016-10-26 清华大学 Electronic control high-pressure oil atomizer with improved armature device
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CN114439662A (en) * 2022-02-22 2022-05-06 一汽解放汽车有限公司 Switching valve and common rail system

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